Data Center Grounding System Selection: Technical Standards And Construction Specifications For Copper-clad Grounding Rods
In the electrical engineering design of data centers, the selection of grounding system materials directly affects equipment operational stability and personal safety. According to the "GB50174-2017 Data Center Design Code," the grounding resistance value of the grounding device must be below 1Ω, which places stringent requirements on the conductivity and long-term stability of the grounding electrode material. With its low resistivity and excellent corrosion resistance, copperbond earth rod has become one of the most widely used vertical grounding electrode materials in data center grounding projects.
Technical Positioning of Copper-Clad Grounding Rods in Data Center Grounding Systems
Data center grounding systems typically encompass four categories: AC working ground, DC working ground, safety protection ground, and lightning protection ground. Standards require a combined grounding mode, where all the above grounding types share a single grounding device, and the grounding resistance is set to the minimum value among all types. Within this framework, the current dissipation capacity and grounding resistance value of the grounding electrode directly determine whether the entire system meets the standards. earth bonding rod uses a steel core as the base and is covered with a high-purity copper layer. While retaining the mechanical strength of the steel, the copper layer provides a reliable conductive path and anti-corrosion layer. It is suitable for vertical driving into the soil as a grounding electrode. Especially in sites with high soil resistivity, after backfilling with a resistance-reducing agent, it can effectively reduce the grounding resistance to the range required by the standard.
Construction Key Points and Connection Specifications
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Welding Process: When connecting the ground rod 3 4 x 10 grounding rod to a copper conductor or copper busbar, an exothermic welding process should be used. The joint must be completely fused and covered, with a smooth surface and no pores, to ensure the long-term conductivity reliability of the connection point.
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Grounding trunk line laying: The cross-sectional area of the grounding trunk line leading from ground rod 8 ft should not be less than 35mm² copper core wire, and it should be laid along a separate path along the weak current shaft to reduce coupling interference with other lines.
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Equipotential bonding: The artificial grounding grid composed of threaded copperbond earth rod rods needs to be reliably connected to the copper strip grid (cross-sectional area not less than 25mm²) under the antistatic floor in the computer room through the equipotential bonding strip. The grid size is set in stages according to 600mm×600mm or 3m×3m, and the intersection points are welded and fixed.
The data center grounding system is not a one-time project. After completion, professional personnel must periodically test and record the grounding resistance values of the copper-clad grounding rods. With equipment expansion, the grounding grid's load-bearing capacity should be verified simultaneously with each new batch of server racks to prevent accelerated aging of equipment components or abnormal fluctuations in traffic due to the grounding system not being upgraded in sync.
